| alkali | any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water |
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| alkali | a mixture of soluble salts found in arid soils and some bodies of water |
| alkali | a common solitary bee important for pollinating alfalfa in the western United States |
| alkali | plant of western North America having grasslike leaves and greenish-white flowers |
| alkali | any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium) |
| alkali | poisoning resulting from the ingestion of an alkali compound (as lye or ammonia) |
| alkali | (chemistry) relating to or containing an alkali |
| alkali | turn basic and less acidic, of solutions and substances |
| alkali | volumetric analysis using standard solutions of alkali to measure the amount of acid present |
| alkali | (chemistry) relating to or containing an alkali |
| alkali | any of the bivalent metals of group II of the periodic table (calcium or strontium or barium or magnesium or beryllium) |
| alkali | any of the monovalent metals of group I of the periodic table (lithium or sodium or potassium or rubidium or cesium or francium) |